Song Seung Hun and Park Min Young Change Roles in Japanese Dr. Jin

The characters of Song Seung Hun and Park Min Young in Time Slip Dr. Jin will make a slight change in their relationship in the upcoming Japanese version. The lovers in the Korean version will become siblings in the Japanese version of Dr. Jin, which is scheduled to air on May 25th in Japan. Dr. Jin is based on a Japanese original and will star JYJ's Kim Jae Joong as well.
A drama official told enews about the change, "We expect the change in relationship will help the drama describe with more detail the emotions attached to the event." The official added that while the setting of the past hasn't changed, the actors will become siblings and new scenes with child actors will be filmed. There will also be more narration from Song Seung Hun.
Both Song Seung Hun and Kim Jae Joong are very popular in Japan so the drama has been gathering a lot of interest. There is even a rumor that the show might be aired on main Japanese broadcasts.
What do you think of the change in the characters' relationship?
(Source: www.sg.entertainment.yahoo.com)